Appendix
en
Installation and operating instructions Wilo-EMU TR/TRE 212 ... 326-3
45
CSA Ex rating
The mixers are suitable for operation in potentially explosive atmospheres:
ƒ
Protection class: Explosion-proof
ƒ
Category: Class 1Division 1
13.3.4
Electrical connection
DANGER
Risk of death due to electrocution!
Improper conduct when carrying out electrical work can lead to death due to electric
shock! Electrical work must be carried out by a qualified electrician in accordance
with the locally applicable regulations.
ƒ
Always connect the mixer to an electrical outlet outside the explosive area. If the
connection has to be made within the explosive area, then the connection must be
carried out in an Ex-rated housing (ignition protection class according to
DIN EN 60079‑0)! Non-compliance will lead to a risk of fatal injury from explosion!
The connection must always be carried out by a qualified electrician.
ƒ
All monitoring devices outside the “spark-proof areas” must be connected via an in-
trinsically safe circuit (e.g. Ex-i relay XR-4...).
ƒ
The voltage tolerance may not be higher than max. ±10 %.
Overview of possible monitoring devices:
TR 212...
TR/TRE 216...
TR/TRE 221...
TR/TRE 226-3...
TRE 312...
TR/TRE 316...
TR/TRE 321...
TR/TRE 326-3...
Motor compartment/sealing chamber
−
−
−
−
−
−
−
−
Pre-chamber (external pencil electrode)
o
o
o
o
o
o
o
o
ATEX approval
Motor winding: Temperature limiter
o
o
o
o
o
o
o
o
Motor winding: Temperature controller and
limiter
•
•
•
•
•
•
•
•
FM/CSA-Ex rating
Motor winding: Temperature limiter
•
•
•
•
•
•
•
•
Motor winding: Temperature controller and
limiter
o
o
o
o
o
o
o
o
Legend
− = not available/possible, o = optional, • = standard
13.3.4.1 Monitoring of motor winding
DANGER
Risk of explosion due to overheating of the motor!
If the temperature limiter is connected incorrectly, there is a risk of explosion due to
overheating of the motor! Always connect the temperature limiter to a manual re-
activation lock. This means that a “release button” must be manually activated!
The installed sensor specifies the trigger temperature as part of thermal motor monit-
oring. Depending on the thermal motor monitoring version, the following triggering
status must occur when the trigger temperature is reached:
ƒ
Temperature limiter (1 temperature circuit):
The unit must be deactivated
with anti-reactivation lock
once the trigger temper-
ature has been reached!
ƒ
Temperature controller and limiter (2 temperature circuits):
